Historian Joseph Ellis talks about four of America's 'Founding Fathers' – George Washington, Alexander Hamilton, John Jay, and James Madison – who 'made something happen that was otherwise never going to happen.'

The gas chamber remains on the books as a possible execution method in some states. Historian and author Scott Christianson talks about the gas chamber's surprising past and his expectations for the future.

Rowling recently delved into the history of the Dursleys on the website Pottermore, discussing their relationship with Harry's parents Lily and James and what really happened with Harry's Aunt Petunia in the final 'Potter' book.

After attending a panel discussion on 'The Crisis of American Fiction,' in which an all-male panel discussed only male authors for an entire hour, author Kamila Shamsie began to research the dearth of women in publishing and literary fiction.

Lee portrayed evil wizard Saruman in the 'Lord of the Rings' trilogy, which was released between 2001 and 2003, as well as the later 'Hobbit' films. He was a big fan of the book series himself and recalled how those on set would ask him obscure 'Rings' questions. 'They never caught me out – not once!' he said.